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Technical Data Sheet
PartsTable / MRO / 18266-1
18266-1 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The 18266-1 is a the manufacturer industrial component. Key specifications include color: BLACK, material: RUBBER FLUOROCARBON CLASS FPM, hardness_rating: 75.0 SHORE DUROMETER A NOMINAL, outside_diameter: 0.691 INCHES NOMINAL IN, special_features: LOW COMPRESSION SET, center_hole_diameter: 0.544 INCHES MINIMUM AND 0.558 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-166-0991, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ 18266-1
NSN: 5331-00-166-0991
FSC: 5331 — O-RING
CAGE: 66503 — WOODWARD, INC. DIV FUEL SYSTEMS AND CONTROLS (USA)
SPECIFICATIONS
colorBLACK
materialRUBBER FLUOROCARBON CLASS FPM
hardness_rating75.0 SHORE DUROMETER A NOMINAL
outside_diameter0.691 INCHES NOMINAL IN
special_featuresLOW COMPRESSION SET
center_hole_diameter0.544 INCHES MINIMUM AND 0.558 INCHES MAXIMUM IN
elongation_percentage125 MAXIMUM
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
material_document_and_classificationMIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyPACKING, PREFORMED-"O"RING, MIL-R-83248, 75 DUROMETER
NSN5331-00-166-0991
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 18266-1 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
COLOR: BLACK
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
COLORBLACK
PART NAME ASSIGNED BY CONTROLLING AGENCYPACKING, PREFORMED-"O"RING, MIL-R-83248, 75 DUROMETER
MATERIALRUBBER FLUOROCARBON CLASS FPM
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
END ITEM IDENTIFICATIONMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
SPECIAL FEATURESLOW COMPRESSION SET
OUTSIDE DIAMETER0.691 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
VIT0NXAX015Interchangeable
interchangeable cross-reference
interchangeable
AX015VIT0NInterchangeable
interchangeable cross-reference
interchangeable
110-100-015Interchangeable
interchangeable cross-reference
interchangeable
MILR2765ESInterchangeable
interchangeable cross-reference
interchangeable
S9413-015Interchangeable
interchangeable cross-reference
interchangeable
M93248/1-014Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18266-1?
18266-1 is a 18266-1. It is classified as a MRO (MRO_GENERAL).
What parts can replace 18266-1?
There are 28 known substitutes for 18266-1: VIT0NXAX015, AX015VIT0N, 110-100-015 and 25 more. Substitute compatibility should be verified for your specific system.
Is 18266-1 still available?
18266-1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026